Replace Image WordPress Plugin

The Replace Image plugin adds a button to the Attachment Details screen which allows you to upload or select an image to replace the current image while retaining the URL and attachment ID. This allows you to easily swap in an updated version of an image without having to re-select it in theme settings pages, post/page content, or anywhere else where it might be referenced.

Important: Disable your browser’s cache and any WordPress caching plugins before use; otherwise, the plugin may appear not to work. See Tools > Replace Image for instructions.